IGameInventory

https://partner.steam-api.com/IGameInventory/GetHistoryCommandDetails/v1/

Name	Type	Required	Description
appid	uint32	Yes	appid of game
steamid	uint64	Yes	The steam ID of the account to operate on
command	string	Yes	The command to run on that asset
contextid	uint64	Yes	The context to fetch history for
arguments	string	Yes	The arguments that were provided with the command in the first place

https://partner.steam-api.com/IGameInventory/GetUserHistory/v1/

Name	Type	Required	Description
appid	uint32	Yes	appid of game
steamid	uint64	Yes	The Steam ID to fetch history for
contextid	uint64	Yes	The context to fetch history for
starttime	uint32	Yes	Start time of the history range to collect
endtime	uint32	Yes	End time of the history range to collect

https://partner.steam-api.com/IGameInventory/HistoryExecuteCommands/v1/

Name	Type	Required	Description
appid	uint32	Yes	appid of game
steamid	uint64	Yes	The asset ID to operate on
contextid	uint64	Yes	The context to fetch history for
actorid	uint32	Yes	A unique 32 bit ID for the support person executing the command

https://partner.steam-api.com/IGameInventory/SupportGetAssetHistory/v1/

Name	Type	Required	Description
appid	uint32	Yes	appid of game
assetid	uint64	Yes	The asset ID to operate on
contextid	uint64	Yes	The context to fetch history for

UNDOCUMENTEDPOST

https://api.steampowered.com/IGameInventory/UpdateItemDefs/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	Steamworks Web API publisher authentication key.
appid		uint32	Yes	appid of game
itemdefs		JSON array	Yes	One or more Item Definitions, presented as a JSON array, to be updated or created.

Steam Web API Documentation